Marine boiler



Cil

Patented Jan. 20, i925,

PATENT ANDERS STRMMAN, OF TRONDHJEIVI, NORWAY.

MARINE BOILER.

Application filed June 19, 1923.

To all ywhomy t may concern.:

Be it known that I, ANDERS STRMMAN, a subject of the King of Norway, and residing at Trondhjem, Norway, have invented certain newv and useful Improvements in Marine Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying ilrawings, and to letters or figures of reference marked thereon, which form a part of this specification.

The prese-nt invention relates to marine boilers and has for its object an arrangement for obtaining the most economical utilization of the combustible in boilers of this kind.

This is obtained in accordance with the present invention by mea-ns of the combination of the two following features, that is, mounting an auxiliary fire bridge a certain distance in front of the old fire bridge, coveri ng the part of the grate between said lire bridges with briclwo-rk or sheet metal or the like and supplying auxiliary combustion air in an upwardly direc-ted current through openings in a horizontal covering plate extending rearwards from the top of the old fire bridge.

lt has been proved by practical experiments that it is possible by the simultaneous application of these twoarrangements to obtain a considerable improvement in thc economy of old boilers.

On the drawing a forni of the invention is illustrated by means of a vertical section through part of an ordinary marine boiler.

Serial N'o. 646,458.

l represents the grate and 2 the ordinary old lire bridge. 3 represents a new fire bridge which is mounted on a grate a certain distance in front of the old tire bridge. The part of the grate located between the two tire bridges is covered upy by brickwork or otherwise as indicated at Il.

Behind the old fire bridge there is mounted a horizontal covering plate 5 which is provided with openings 6 adjacent the rear surface of the old fire bridge 2. Through these openings auxiliary combustion air is supplied in an upwardly directed current, said auxiliary combustion air being introduced through an opening 8 provided in the `wall 7 below the fire bridge 2.

Claim In marine boilers, a boiler furnace, a lire tube the-rein, a grate therein, a lire bridge terminating the grate at the rear end of the lire tube, an auxiliary fire bridge mounted upon the grate a distance in front of the first named fire bridge, imperforate means completely covering the space between the two fire bridges, a, horizontal cover plate extending rearwardly from the top rear edge of the first named fire bridge, auxiliary air openings in said cover plate adjacent the first named fire bridge, a wall extending downwardly from the first named fire bridge, and cooperating auxiliary air apertures in the lower portion of the wall.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

ANDERS STROMMi-XN. litnesses ANDERS VINEs, JOHN NORDRETRACY. 

